#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

int main() {
    int a;
    while (scanf("%d", &a) != EOF)
    {
        for (int i = 1; i < a + 1; i++)
        {
            for (int j = 1; j < a + 1; j++)
            {
                if (i == 1 || i == a)
                {
                    printf("* ");
                }
                else
                {
                    if (j == 1 || j == a)
                    {
                        printf("* ");
                    }
                    else
                    {
                        printf("  ");
                    }
                }
            }
            printf("\n");
        }
    }

    return 0;
}